package sparse;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

public class SpareArray {

    public static void main(String[] args) throws IOException {

        //创建一个原始的二维数组
        //0表示没有棋子，1表示黑子，2表示白子
        int chessArr1[][] = new int[11][11];
        chessArr1[1][2] = 1;
        chessArr1[2][3] = 2;
        chessArr1[3][4] = 1;
        PrintUtil.printMethod(chessArr1);

        //转为稀疏数组
        //1.统计有效数据的个数
        int sum = 0;
        for (int i = 0;i < chessArr1.length;i++){
            for (int j = 0;j < chessArr1[i].length; j++){

                if (chessArr1[i][j] != 0){
                    sum++;
                }
            }
        }
        //2.创建稀疏数组并初始化第一行
        int sparseArr[][] = new int[sum+1][3];
        sparseArr[0] = new int[]{11, 11, sum};
        //3.赋值其他行
        int count = 0;
        for (int i = 0;i < chessArr1.length;i++){
            for (int j = 0;j < chessArr1[i].length; j++){

                if (chessArr1[i][j] != 0){
                    count++;
                    sparseArr[count][0] = i;
                    sparseArr[count][1] = j;
                    sparseArr[count][2] = chessArr1[i][j];
                }
            }
        }
        //输出并存到文件中
        File file = new File("D:/result/array/test01.txt");
        FileWriter fw  = new FileWriter(file);
        for (int[] row : sparseArr){
            for (int data : row){
                System.out.print(data + "\t");
                fw.write(data + "\t");
            }
            System.out.println();
            fw.write("\n");
        }
        fw.close();

        //从文件中读取稀疏数组
        BufferedReader br = new BufferedReader(new FileReader(file));
        String line;
        List<Integer> list = new ArrayList();
        int row = 0,column = 0;
        while ((line= br.readLine()) != null){
            String[] temp = line.split("\t");
            for (int i=0; i<temp.length; i++){
                list.add(Integer.valueOf(temp[i]));
            }
            column = temp.length;
            row++;
        }
        br.close();
        int[][] sparseArr2 = new int[row][column];
        int count2 = 0;
        for (int i=0; i<row; i++){
            for (int j=0; j<column; j++){
                sparseArr2[i][j] = list.get(count2);
                count2++;
            }
        }
        //转为二维数组
        int row2 = sparseArr2[0][0];
        int column2 = sparseArr2[0][1];
        int[][] chessArr2 = new int[row2][column2];
        for (int i=1; i<sparseArr2[0][2] + 1; i++){
            row2 = sparseArr2[i][0];
            column2 = sparseArr2[i][1];
            chessArr2[row2][column2] = sparseArr2[i][2];
        }
        PrintUtil.printMethod(chessArr2);
    }


}
